Indicator for inclosed fuses.



O. G. HOFFMANN.

INDICATOR FOR INGLOSED FUSES.

APPLICATION FILED NOV. 5, 1904.

Patented Mar. 39, 1910.

I /y ZNTOR B y Altome a UNITED STATES PATENT (EFFIQE.

B'ZTO G. HOFFMANN, OF'BUFFAIQO, NEW YORK, ASSIGNOR-TO CHICAGO FUSE WIRE &; MANUFACTURING EOMPANY, OF BUFFALO, NEW YORK, A CORPORATION.

INDICATOR roe rncLosEn rusns.

Specification of Letters Patent.

Application filed November 5, 1904.

Patented ;1\Iar.-- 29, 1910.

Serial No. 231,492.

To all whom it may concern: I

'Be it known that I, O'r'ro C. HOFFMANN, a-'citizen of the United States, residing at Buffalo, in the county of Erie and State of 5 New York, have invented-new and useful Improvements in Indicators for Inclosed Fuses, of which the following is a specification.

This specification relates to indicators for inclosed fuses and consists of a novel disposition and arrangement of the indicator 'fuse or indicating conductor so that it may be fully protected while lying wholly on the surface of the fuse case, and also may be so entirely inclosed as to prevent flash upon fusing, the cover being of such a nature as to indicate the presence of the fuse. As illustrative of this invention in one of its forms, the accompanying drawing may be described as follows Figure 1 is a. side elevation of the inclosed fuse; Fig. 2 is a longitudinal sectionwith parts shown beyond the plane; Fig. 3 is an end elevation with the cap in section, showing notches and position of the indicator conductor; Fig. 4. shows one form of the inclosure for the enlarged depression or receptacle for the indicator; Fig. shows a fragment of the casing giving a view of the notch with the indicator conductor broken away for a part of its length. Figs. 6 and 7 illustrate varied forms undenthis, invention.

In these figures similar letters indicate like parts throughout. I A longitudinal slot A may be provided as shown in Figs. 234.6.and '7 which may extend more or less of the distance from end to end of the casing on its exterior surface and may lead into notches 6 such as is shown in Fig. 5,- also clearly seen in Fig. 3- As shown in this figure the notch is prefer ably turned at an angle to the radius and continued on the farther side of the casing 1), Figs. 2 and 5. No slot, however, necessarily exists on the farther face of the cas-'* ing at or near I). At any desired point between the caps B Bis a depression such as is shown at G in Figs. 1, 2 and 4 and in dotted lines in Fig. 3. --This depression communicates with the slot.A. In the depression A is laid an indicator conductor or auxiliary' fuse a' which is provided with an enlargeinent a, such, for instance, as is described in lily-prior application, Serial No.'

204,707, dated April 25th, 1904. This wire or conductor may be placed suitably in circuitbut I prefer to haveit as long .as possible for obviousre'asons, and to this end I may pass it around the ends of the casing as 1s shown in Figs. 2 and 8 and bring it in electrical contact at ,the farther side as is shown in Fig. 3 at point a, retaining notches 5 such as is shown in Figs. 2, 3 and 5 may be provided which are found to greatly facilitate-the handling and retention ofthe wire after being placed. This action may be illustrated by the holding notch in the flange of ordinary th'read spool.

The circuit connection to the independent wire a may be effected by Simple impingement between the casing and capsgB at any suitable point along this length, but Iprefer to have it at the farther side of the easing so that the indicator fuseshall be as long aspossible, as statedin this-instance, longer than the. greatest length of the inclosed fuse itself. It will be plainly seen that the slot- A allows this indicator to remain entirelyout of circuitconnection at all points where theslot passes underrthe caps in cases where long slots are used.

In case of long slotsa. packing, or filling D may. beeniployed at either end under the cap to fill the slot A and prevent egress of the contents of thefuse. A covering e'for the enlarged depression may be held by its side walls and may also protrude beyond the limits of the depression as indicated at e in Fig. 4. Any means for attaching this cover or any suitable cover which will indi-' cate the presence of the indicator may be employed, but I prefer a transparent cover such as mica.- The slot throughout its length may be open, but I prefer to have it inclosed as is shown in Figs. 1 and 2 by suitable. cover gg. This 1s;-als'o shown in dotted lines in Fig. 4,.and may extend to or under the caps B as shown in Fig. 4. This covering may be in more than one part, but in. the figures I have represented it as consistin o 'Wfill an opening through which may be seen the fuse a. The label as a plied in 1 is enabled also to secure the edges 0' the transparent covering 6 shown in the figures, thus performing the double function of constituting a cover for the slot A, and also means of securing the transpargnt cover 6. d

the label upon the fuse and provided 1 cc e ry sh length the owing to the fact that it has lessened cross section and current carryin tl 's point a the indicator fuse at this point, The cone 7. being easily ascerta ed through in the label g and .ne trens' serent e. The filling of the fuse may be in any Well known form but lfprefer tl'iat it be broken up by u uoirconducting eriel. as shown in 2 and 3 for the purpose of breaking up any continuity of creche crevices existing in the filling.

parts in the relation shown some me}! be employed Without the others and invention extends to such use.

niunication from the inte" L on of the casing the exterior through Wl lilting nun sift or blow es orig- 7 used for bringing the Wire a to the as the transparent cover providesthet at ail times the indicutm: is under tie sin Face.

I'claim z- 1. In an inclosed fuse a surface of the casing, an electrical conductor in the slot and an enlargement in the slot or depression located between the caps. I

2. In an inclosed fuse a casing and end caps for the fuse, 21 slot in the exterior surtace of he casing, an ele icei conductor in the slot depression located between the cans, 2 cover for the slot and a separate cover ror the enlarged portion.

1 in the slot .lll enlzu, oration 1 feet that l F cams for the fuse u slot in the exterior sur- 7 Wrnle 1t 1s designed. to employ ail the ch the holes cups for the fuse, a slot in the exterior sur casing and end 1 caps for the fuse, e slot in the QXtGIlOI the enlar ed ortion and 21, trans erent cover E5. in on inclcs Fuse u casin and end caps for the i e, u slot in the exterior surface of the casing, on electrical conductor 0 ,ient in the slot or depre sion located the c 1P; .vire being provided With an enlarged suri e located Within the enlarged portion of L l, slot.

l. An indicator conductor for a inelosed luse lying along one side the casing of the fuse passing around the ends out of electrical Contact and means for eilecting electrical contact on the lurther side of the casing.

In an inelosed fuse ceasing and end cups for the fuse, e slot in the exterior sureovering face of the casing on electrical conductor in the slot, an enlargement in the slot or depression located between the cups, 2, cover tor the slot having an opening and a transparent portion covering the opening.

In an inclosed fuse a casing and end face of the casing an electrical conductor in the slot, an enlargement in the slot or depression located between the caps, 2L cover tor the slot provided With will be seen that there is no direct conian opening ar ranged us to location so as to register with he enlarged portion and a transparent cover to the enlarged portion.

'Z. In en inclosed fuse u casing and end of the casing, an electrical conductor in the slot, an enlargement in slot or depression located between the caps a cover for the slot provided with an opening, larrenged. as to location so as to register with for the enlerued oortion the trensoerent O .L 7 L in testimony whereof I have hereunto set 1 my hand in presence of two subscribing witnesses. an enlargement in the slot or ()Tlt) C. HOFFB lANil. e itnesses A. D. DANA, Ferns Miami. 

